Roller-bearing for tire and trunnion type mills



. 5, 1919. 1,401,536, Patented D60. 27, 1921.

2 sHEETs-sHEEr 1.

F. D. GROSS, R. P. AKINS AND J. W. BUCHER. ROLLER BEARING EoR TIRE AND IRuIIINIoN TYPE MILLS.

APPLICATION FILED NOV. 5,1919.

Patented Deu. 27, 1.921.

2 sIIELTs-SIIEVET 2.

J9? mm J .l c I l To all whom it concern l UNITED STATES PATENT OFFICE.

" iinnnnmci:` DANIEL enoss, RANDALL roman axnvs, AND JOHN WILLIAM suenan,

, e or DENvnncoLonAno.

i :HOLDER-BRING FOR TIRE A N'D TR'UNNION TYPE Be it known that we, FREDERICK` D. Gnoss, RANDALL P. AKINB and JOHN W. BCHER` citizensof the `United States, residents o i Denver, Colorado, have invented certain new, and useful` Improvements in Roller- Bearings for Tire and Trunnion Type Mills, of which the following isa specification.

Our invention relates to improvements in bearings for` cylindrical grinding mills,

` commonly known as tube mills, ball mills or rod mills. e i In such mills as are used in the grinding of orcs or other materials, it has been found that `a great.` excess of power is required; due mainly to the manner in which all types ofpresent mills of which we are aware are `carried in their bearings.

H `Our present invention `aims to carry the `cylindrical mill at orlnear its center on a removable tire supported on rollers, which are carriedlin a casin entirely surrounding the "mill and which ro ers run on a track which forms an are of a circle. Uur invention aims as `an oil reservolr for to supportthis track in a housingwhich acts purposes of lubrication and to provide a ghter housing carriedfrom this lower housing or oil reservoir around the balance of the rollers to keepthe same free( from `gritfand dirt. i e

One end of the mill, preferably the feed l end, is supported by an ordinary trunnion bearing.` This trunnion bearing is not intended tocar any appreciable portion of the mill load, ut acts merely as a guide to balance the mill upon the main roller bearing. `By so doing the other end of the mill,

namely the discharge end, is left easy 0fac- 1 cess so that the head `can easily be removed,`

to enable new linings to be placed in the mill or enable the operator to easily inspect the C interior of the mill at all times.

An embodiment of our invention is illustrated in the accompanying e drawings in which Fi ure 1 is a longitudinal section through t e center of the mill showing the rollers in the form of segments of cones, the

\ vertices of these cones all intersecting on the axis of the mill, one set converging toward the feed end and the other set toward Fig. 2 is an enlarged detail, of the removable tire, the conical rollers with their casspecmcation of Letters Patent.

MILLS.

Patented Dec. 2'?, 1921.

modilied form of the mill showing cylindrical rollers, with a cylindrical tire and a cylindrical track. i

Fig. 4; is a partial end elevation and partial cross section of the mill shown in Fig. Referring by reference characters to these drawings the letter a designates the cylindrical shell of the mill, which is fastened at each of its ends to a flangering ZJ so designed as to fit into the counterbore of the feed and discharge heads 0. The outer shell a is protected from abrasion of the material being ground by the lining d and the heads c are protected by the lining 6. The material to be crushedor ground is introducedinto the mill by means of an ordinary spiral scoop feeder f which delivers this material into the wearing sleeve j i which has on its inner surface a spiral which forces the material to be ground into the mill.

The trunnion g of the feed headtc is protected from wear by this same wearing sleeve j, The `trunnion g is carried in a large ball and sockjet bearing, the letter 9%. indicating the ball and the letter iindicating the socket member. The discharge head is also protected from wear by means of the sleeve la which also acts as a spout to deliver the crushed or ground material from ythe mill into a launder or other receptacle.

The conical ogr cylindrical rollers of the main bearings are indicated by the letter l and means for supponting these rollers and keeping them in properly spaced posi-V fastening the tire in position. Due to the fact that coacting faces of the 'tire and ring sect-ions p and g are inclined a wedging action is secured which eilfectually prevents the tire o from slipping or crawling onv the ring p.

The stationary portion of the main bearing is a large substantial channel-shaped casting t which is lined with a removable tracl u which may be of double, frustroconical shape as sho-Wn in Figs. 1 .and 2. This housing t has sides l 4which extend almost to the shell a, thus forming a large and capacious oil reservoir. Y

' at omand um respectively in Figs. 3 and el and use a sinole setof c flindrical antifriction rollers spaced and guided by the side rmgs W1/7. rlhe cylindrical mill may be rotatedon its axis by any suitable means such for example as the spur gear y attached to the shell of the mill, as

V'raving thus described our invention,

what we nonr claim is fi l. In ya cylindrical mill, a cylindrical mill shell having an annular tire, an annular serie-sof traveling rollers encircling said tire with means for holding them 1n spaced f relation, and an arc-shaped support beneath said'tireupon which the lowermost rollers .of the series travel.

2. `in acynndriennan, ayudaran min l shell, having an annular tire, an annular series of traveling rollers encircling said tire, a cage ring for holding said rollers in spaced relation, ,sa stationary support beneath the :shell having an arc-shaped portion upon which the lowerniost rollers travel, and a removable housing encircling the remainder of the rollers and having its ends connected with said support.

3.111 a cylindrical mill, a mill shell, an annular tire encircling the same, wedge means for removably holding said tire on said shell, a stationary support having an arc-shaped bearing surface beneath said tire, a roller cage ring encircling said tire, and spaced rollers lcarried by said cage ring and arranged to travel between the tire and support as the shell rotates.

el. In a cylindrical mill, a mill shell, having a rigid ring section thereon with an inclined surface, a removable 'ring section having a reversely inclined surface with means for securing it to said rigid ring section, a tire having an inner surface reversely inclined to coact with the surfaces of said rigid and removable ring sections, an annular series of traveling rollers encircling said tire with means for holding them in spaced relation, and a stationary arc-shaped track beneath the shell upon which the lowermost rollers bear.

lin a cylindrical mill, a mill shell journaled upon a substantially horizontal axis, an anti-fricton bearing at substantially the center of gravity of the shell for sustaining the weight thereof, a trunnion at one end of the shell having a feed aperture, said shell having an unobstructed delivery opening at the opposite end.

In testimony whereof, we aiix our signatures.

`FREDERICK DANIEL GROSS.

RANDALL PORTER AKINS. VJOHN fWILLIAM BCHER.

Iii) 

